Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
355/25r21 vs 275/35r19 Tire Comparison Side By Side
  355/25-21 275/35-19 Difference
Diameter inches (mm) 27.99 (710.9) 26.58 (675.1) -1.41 (-35.8) -5%
Width inches (mm) 13.98 (355) 10.83 (275) -3.15 (-80) -22.5%
Circum. inches (mm) 87.93 (2233.36) 83.5 (2120.89) -4.43 (-112.47) -5%
Sidewall Height inches (mm) 3.49 (88.75) 3.79 (96.25) 0.3 (7.5) 8.5%
Revolutions per mile (km) 720.59 (447.76) 758.81 (471.5) 38.21 (23.74) 5.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.99 mph (30.57 km/h)
25 mph (40.23 km/h)23.74 mph (38.21 km/h)
30 mph (48.28 km/h)28.49 mph (45.85 km/h)
35 mph (56.33 km/h)33.24 mph (53.49 km/h)
40 mph (64.37 km/h)37.99 mph (61.13 km/h)
45 mph (72.42 km/h)42.73 mph (68.77 km/h)
50 mph (80.47 km/h)47.48 mph (76.42 km/h)
55 mph (88.51 km/h)52.23 mph (84.06 km/h)
60 mph (96.56 km/h)56.98 mph (91.7 km/h)
65 mph (104.61 km/h)61.73 mph (99.34 km/h)
70 mph (112.65 km/h)66.47 mph (106.98 km/h)
75 mph (120.7 km/h)71.22 mph (114.62 km/h)
80 mph (128.75 km/h)75.97 mph (122.26 km/h)
85 mph (136.79 km/h)80.72 mph (129.91 km/h)
90 mph (144.84 km/h)85.47 mph (137.55 km/h)
95 mph (152.89 km/h)90.22 mph (145.19 km/h)
100 mph (160.93 km/h)94.96 mph (152.83 km/h)

Gear Ratio / RPMs for New Tire (@ 65 mph)
2.35 2.73 2.94 3.07 3.21 3.31 3.42 3.55 3.73 3.91 4.11 4.27 4.56 4.88 5.13 5.29 5.38 5.71 6.17 7.17
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